I am a little confused by this one! I would assume that it would go up like this:1. 52. 253. 1254. 6255. 3,750

It's a tricky part. You think it would go by order from 1 to 5, but by that person's reply I think it fools you. It's because if 1=5 then 5=1 in reverse. Like in muliplication, 1X5=5 and 5X1=5; they're the same. I think this is how it goes....